Oven thermometer



Jim@ l2, 1923.

G. J. 'DAY OVEN THERMOMETER Filed Aug. `19, i921 WHO rney-s;

Patented .lune l2, 1923.

Utl TT GEORGE J. DAY, OF BUFFALO, NEW YORK.

OVEN THERMMETER.

Application filed .August 19, 1921. Serial No. 493,768.

To all whom it may concern Be it known that I, GEORGE J. Dar, a citizenof the United States, residing at Bualo,

in the county of Erie and State of New` lts chief object is theprovision of a detachable thermometer of this character capable of beingreadily applied to and removed from ordinary or existing oven doors,without in any way altering their construction.

Another object of the invention is to provide a removable thermometerwhich is simple and compact in construction and which can bemanufactured at a low cost..

A. further object is to provide the thermometer with an improved pointeror indicator which is so mounted as to practically eliminate friction,thus insuring its free and reliable action under all conditions.

In the accompanying drawings:

Figure 1 is a front view of an oven showing one form of my improvementapplied thereto. Figure 2 is a fragmentary horizontal section, on anenlarged scale, on line 2-2, Fig. 1. Figure 3 is an enlarged fragmentaryvertical section on line 3 3, Fig. 1. Figure 4 is an enlargedfragmentary rear view of the oven door showing the thermometer inposition thereon. Figure 5 is a perspective view of the thermometer.Figure 6 is an enlarged sectional elevation ofthe dial plate and itspointer 'or indicator-hand. Figure is a perspective View of a modifiedform of theimprovement. Figure 8 is a rear view of a different style ofoven door, equipped with said modified form of thermometer.

Similar characters of reference indicate corresponding parts throughoutthe several views. y l

In the embodiment ofthe invention shown in Figs. 1-6, the thermometer isshown as applied to a portable oven 10 of well-known constructionvhavinga swinging door 11 providedfwith a transparent vpanel or window pane.v12 of glass or other appropriate material. The pane is confined in theusual groove or channel, which in the example illustrated in thedrawings, is formed between the frame ofthe door and the flanged orrabbeted back-strips 13 suitably secured t'o the inner side of saidframe, as shown in Figs. 2, 3 and 4.

Detachably mounted on the inner side of the oven door and in one cornerthereof, is the improved thermometer which preferably comprises arectangular base or bodyv portion 1'4 of sheetvmetal or otherappropriate material having suitable ears, flanges or projections 15, 16at adjacent upright and horizontal edges thereof, adapted to beinsertedbetween the flanged back-strips 13 and the rear side of the window pane,whereby the base is reliably held in place on the door but at the sametime removable therefrom. As sh'own in Figs. 2, 3 and 5, these fianges,which are preferably'formed integrally with said base, are raised oroffset forwardly therefrom and substantially parallel to the planethereof, so as to space the base sufficiently from the back of thewindow pane to receive the remaining elements of the thermometer. v Forthis purpose, the fianges 15 and 16 are connected with the base by webs15a, 16a., arranged substantially at right angles to the base.

17 indicates the dial or indicator plate of the thermometer suitablysecured to the front side of the base 14 and bearing on its face asubstantially semi-circular graduated temperature scale18 which istraversed by a hand or pointer 19. In the preferred construction shown,the dial plate is held against vertical dis lacement by retaining lips20,21 forme on the base and bent around the upper and lower edges of thedial plate. Horizontal displacement ofthe latter is prevented by the web15a at one edge of the base and by a forwardly bent re taining flange 22at its opposite edge.

, Any suitablethermal means may be employed for controlling the movementof the pointer 19, but as shown in the drawings, particularly1 Figs. 2,3 and 6, these means preferably comprise a forwardly extending post orarbor 23 rigidly secured to the dial plate at the axis of the scale, anda spiral or volute thermost-atic element 24 fastened at its inner end tosaid post, and carrying the pointer at its free outer' end to which thepointer is suitably secured. rlhis thermostatic element which isconstructed of any suitable thermostatic material, enpandsvand contractsin response to varia-tions in tein-` vperature, moving the pointer overthe dial in one direction or the other. To protect land conceal thespring, aeover or guard plate 25 may extend' over the front sidethereof,said guard preferably projecting inwardly from the retaining'flange 22.if

desired, the front end of' the vpost 23 may Guard-plate and be upsetlpass through said on the outer side thereof, as shown inl Fig. 2,' tobrace;v and stiften the post?. Clearance is provided on both sidesofthe' spiral. spring to permit its free expansion and contraction4Without friction in response to variations in temperature. y

By vthisv constructionA and arrangement of the thermal spring and the.pointer, bearings and otherv friction-producing parts are eliminate-d,ythus rendering the thermometer' very accurate and sensitive to thermalchanges. Furthermore, the' construction is exceedingly" simple and thereare no partswvhich arer AWith vgrease or otherwise attaching i'angesareV comparatively thin and the, flanges off'said bacl'estrips arefieXible or resilient', the thermometer can be fric-A tionallyinterlocked with the door in Ythis manner Without difiicnlty. Thethermometer can be as readily remo-ved'by simply- Wijthdrawing itsattaching flanges 'from the i corner of the door, in an obvious manner.

In the modification of the improvement shown in Figs. 7 and 8", the base26 is provided at either side'i'vith 'upright attaching flanges E27 andat its bottom 'with a horizontal attaching' flange 28. This form oi theinvention 'is designed more particularly for a: door of the' type shownin Fig. 8', hav

ing on,` its 'inner side ay pluralityof Windows or transparent panels 29confinedv in sub-v stantially U-shaped guidey frames 30. nr

applying this modified form. of the improvement to ajdoorroff thischaracter, the thermometer is yinsertedi'n the Vopen upper end of oneofthe guide-frames on the inside ofthe door and' foreedto. the lower endthereof, the upright attachingjflanges 27; engagi'ngf` under t, theupright portion-s of" said giiilde'frame and' the horizontal.' attachingflange under the base portion yof' said frame t It Will' be noted thatinasmuch as the embodiinont of the invention shown/in Figs. 1 5, isprovided at'tWo adjacent sides Vor edgesl With corner-attaching flanges,itis applicable to a door ofthe type illustrated in Fig. 8, as Well* asto; the style of door shown in Fig. I.

The removable character of the ther1nom. y f eter not only perm-its itsready application to existing oven doorsoi various kinds, but alsoenables it to kbe removed for cleaning its dial from time totime. f

1 claimf as my invention: 'i `1. A detachable thermometerfor an ovendoor having auwindoiv pane', said thermometer comprising av base havingmeans mounted thereon for indicatingtemperaturem the( base having amarginali attaching portion conystr-notedl to enter between thelvvindovvpane.

2. A detachable,thermometer for' an oven door having a Window pane, saidthermomes.

and the frame of the` oven door. A l

ter comprising a base liaving'means mounted thereon for indicatingtemperatures, the'V base having an attaching lflange arranged.- at,

its edgefor engagement 'with the oven door, said flange being oiisetforwardly froml said base and substantially paralleli to. the pla-nethereof. f l

.y 3. A detachable thermometer fior an oven: door having a Window pane',saidthermometer comprising a ysubstanti-ally rectangular base havingmeans mounted thereon fory in-y dicating'temperatures,-the base hav-ingmarginal attaching fianges projecting from dif.`

ferent edges thereof and'arranged togen; gage corresponding' sides f of'the oven-door groove which receives said pane'.

4.' A detachable thermometer for anoven: y

door having a Window militie,'saidA thermometer comprising avsubstantially rectangular base having means mounted thereon for iin--dicating temperatures, the base' hav-infgup right and horizontalattaching flanges arranged at adjacent edges tliereof,l sardi frangesbeing "offset forwardlyl from said' base and substantially parallel f tothe plfane thereof 'andi adapted tio-enter between-the Windowpane-'andthe frame of the. oven door. v Y

5. A detachablethermometer tor an oven door having a Winde-W pane, said?ther-momee baseV having means mon-nte )thereon fordicatingtempeiatures,`the bafsefh-av' 1 ginal attaching flangesprojecting?r from-dir'-v ferent edges thereof and arranged substantiallyparallel to thepl'ane' of said base. andi Webs connecting saids Iangesywith the hase and arranged substantially at right'angfles to the base,'saidfianges-being 'adapted to enter between the Windovv-pane and theframe ofthe oven-door. n 6". The combination .with oven door having afWindow-pane and' retaining means therefor, of a removable-t'hermometer'arranged on thel rear side of said door and having attachingmeansinserted between the said' Window-pane and saidl retain-ing means.f f I V 7. The combination With'an oven door having l a window-pane anda retaining groove therefor, of a detachable thermometer arran 'ed onthe rear side of said door 5 and inclu ing a. base having a marginalattaching flange inserted between said Windowpane and the rear Wall ofsaid retaining groove.

8. An oven thermometer, comprising a 10 base provided on its face with anon-rotary forwardly-projecting post and with a dial having a curvedtemperature-scale arranged concentrically with said post, a volutethermostatio element arranged on the outer, dialside of said base andhaving its inner eentral portion fastened to said post, and a pointerfastened to the free outer end of said thermostatic element andtraversing said dial.

GEORGE J. DAY.

Certificate of Correction. v It is hereby certified that in LettersPatent No. 1,458,168, granted June 12, 1923,

' upon the application of George J. Day, of Buffalo, New York, for animprovement in Oven Thermometers, errors appear in the printedspecification requiring correction as follows: Page 2, lines 4 and 17,for the Word spring read @Ze/ment, and line 12, for the Words spiralspring read thermostatzc element; and that the said. Letters Patentshould be read with these corrections therein that the same may conformto the record of the case in the Patent Office.

Signed and sealed this 17th day of July, A. D., 1923.

[SEAL] WM. A. KINNAN,

` I y ,-l v Acting yommvlssioner of Patents.

